@article {mendez2001prvir,
	title = {Prvir: An integration between an intelligent tutoring system and a virtual environment},
	journal = {SCI2001},
	volume = {8},
	year = {2001},
	pages = {175{\textendash}180},
	attachments = {http://nil.fdi.ucm.es/sites/default/files/P000954.pdf},
	author = {Gonzalo M{\'e}ndez and Ang{\'e}lica de Antonio and Herrero, Pilar}
}
